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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d36fc0da693724c494b59de55366c6ed14c99bb92dfd12f80de9aefb6ea8cf0' 
  AND token = 'awDh3JPVfnphmmur62p9IowwyABsJO6mT127z34fk+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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