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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d1f4203e489d0c5fcf78f1089e53200a6211d2ece52bb9de5126b33c648fb3' 
  AND token = 'Am0J7jWGzvP7SfEeb6jzZgm841HzNmnNU79P5xP23kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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