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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136fda4fc6b4963ae32c835b269db85b777423ef5d165aa1713698d8eb34cce0' 
  AND token = 'OBN4SUxanEgfFhaNIi9pUjY6Y4EbAjIpQY0yBiBZ2dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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