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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bfc39d4b7f3960bcf2ff8648077817fbf92b4bfaface12759d76678236f72b' 
  AND token = 'VRXBzFN53G+Q70PlxxJOX+F2kzffTWwjT0f8QuFQ1fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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