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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f3bba3bab075afd89a262ecd1bff5b2adfbad8b364a0d8aaee76dc7a2b0c52' 
  AND token = 'Rjai6nasJmotIGUUZR5FzWdJlEBYRL5F+crx7pxeOWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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