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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb0d5d7ac2c5a2fa962f597d678b6f5d9a82658a8dc59561974dc24a96e53e2' 
  AND token = '+vsQHK90uu2HaL9N44eTn3kjOYYCncNMwMJpu2afdhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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