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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddadee3c56064e8abf81113ddf0047af39c9157b68220fe6ce6755e539b22b9' 
  AND token = 'HU+c7nna8M+mY2IKs9i5vc/w6uxqDGFHn5wIEaSwaiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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