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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812d617a1d48a5a6f962a042d1a96d64ab4370108473892b46f7130b0ddf2a74' 
  AND token = 'ZxSeWi6g89JOV/4+qKlhDcKyUoGG8iuhFcilGSHRo4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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