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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfe162e4221d99ce25e93437131309a646af63dceaf10c56596a4286aa0a5b5' 
  AND token = '8YX3FlydQMdPx5/3oFW7C7vqUgL1iuCcMj8tbGXdO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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