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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5c3ccdeffac22f2d548021b018244b1a21bc5620b71de757fa208d03ce2aa3' 
  AND token = 'eZglOXyqr9vvaUmA2V8pJWNnfN2R0OzxktJcufjw5ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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