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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305f5435d7565f86f5b372ddbfcf88c50f39a845e69799060bc44305bf022e48' 
  AND token = '59Ok/CB4addTkUqOrghNUPvJ9vpux3prVWpIcTFN+3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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