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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f04950eae4429749108a8f7b845def112f4aea2baf7123830c5ede8cf64c734' 
  AND token = 'mOAH+Tw4NO89c3yAtQ96V7pS2HWtdwKOLNmFtn8oi64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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