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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f7e6c1a709d1127f676671e2bf36db997388527612f1c8b4a52b72cc439c7a' 
  AND token = 'yyG9DOjwcLHp05HHSHGUVd8Yv8K7vEZZBFbI28OWMjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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