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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a047908cc4faea18e4d8c7fd7115843aa9d9f97260cd86f4954c5797e741fe9' 
  AND token = 'JE0LMxyrR/BVPhyBoG/2idINQHa9CPRPowX7W/doZuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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