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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a8ebc1364478c9af13bfb29059b93b33db772b86f7184e401efa01021dcfa6' 
  AND token = 'B+1Zg2Gzsy4BAB7EUgv1K9G73exl0PkSzIm8U4cKFiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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