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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f0b2c17d3672bc0f9e1b6bea7727dad3ba4d2f30b330c797b3bdd3284fa8b5' 
  AND token = 'Nrg0xsLgXq10wOdiMdNLx5XBklsAmOkkEE87Ci+dKRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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