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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f5c356a888d9308e444a7f39c825995f7a34b1de37003600d8638b5ba8a79b' 
  AND token = 'z4AMXvd2yVnQmxROQOwesmcyDwt8AXoHXq8NA08uNoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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