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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22488e515a2954bf5fc0e8cf706d3c5ee52af12dcefba31ed6e32adc3aacf16c' 
  AND token = 'OZuqasZyIYwut7Ho+HgEUPbAQL0W78Z9M7bbeWh/MwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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