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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed04e88e6ce03ca92581b83df73a23c2c19c6d88ee691c1756fb31aed45e07aa' 
  AND token = 'XnzAIt3NzMrR0heqJDLYumjRavNEjAK374d8HGylC5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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