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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be66d6380c018a7cd9b2516b61d1f3043dbdae21d2fee4740ee7db7ae32a6079' 
  AND token = 'IalGYODcEzpdU9Im5Xo1uYuyHAqheml2sJUDOh5osCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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