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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b77a8c679b1e52cdf73b361cf941ada0ab01cc75327c0d40ef1069ba1d2a38' 
  AND token = 'Oruyre5qPV8O9Zfj7OXGhErqujSzGFX47VsovtPNjbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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