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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc7340996d31a22e5e05016a652117b5c0b8155b49876ccdee2caff22b0e3db' 
  AND token = 'MgysdiEJlRgCFDQ4iEqcypNRuc9OI0YDoJkY/orXATY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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