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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0434125fe5d4710918a1b378f01b42a045759f1573cee2110e3bd7ca49ac4f3' 
  AND token = '5bqYUwQV0nmewTgVihbxn/4WIqReuZe/HF6EZ/CdpwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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