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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947ef4f1675f73a81d83749dff67994d2db1c543f81c2f8b6b6c91bc64bbdf66' 
  AND token = 'ZuQlw43mWiev75HlNvBC4aKXK2uDs4Y7KBMWduKdR/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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