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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25241037b0b13554cccfaeb8b79ba620931c54ffb19b37d9369cdf3ca6e5560b' 
  AND token = 'ytVnAuoVji5giVboCNiY1GSsU4PKImLAhCRF43SB2Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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