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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77126d410ae264e8b4425c0b42017349e5b1349f01d5374cabbe663311dea5d' 
  AND token = 'kAZ6bGlSxzWB3YKCCmUgE8U6K9SEIHSh3Ezr+q+oLw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}