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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae683a2e9a69c7284f6bbd36e9f3bfaba5cfde0437b9e96cfe7fce6a89a0b7b1' 
  AND token = 'oW3lRY4rGqAvJrahPdPcZDnijAotq5jhD5iqFM3Z1CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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