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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14836c501cc665411e8c505509293a7f9770598dd4756298c587eda4208422fc' 
  AND token = '8ScvC7eyRS2plBRAgpHrz30H9giKgSLf1Pl02e/Qc0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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