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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570ee22858c112f64d1640d30eb8efb6248f579618693622a8866674f300aebc' 
  AND token = '+bup06VKwArSm/39BinuMtNYBFLdDHBeNRFWybe/wok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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