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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8235a361540f1f1fad485f1eed29775679329d2c7193ee60260c8a9ea870b887' 
  AND token = 'EiJvZ4QrIXTB2FpeCj12mbtiRsoTk6QWBwW3S2N5UVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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