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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93731d6a6cf9753c8de7fe5756ff15ee59dd9de24e9c8448eefed3f7e2f67a8f' 
  AND token = 'jviLZobTxwlO75+eg0RnLGHfsE5eR320gnPc0pNacDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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