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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c900cec92ffed66f736aa7b73fd249a193204d1b0b5f82bb5d607458d14f8f' 
  AND token = '/9niQlACE3jwFVmQ2rWVhMYVEFmb2MEo/UnMrjfLbBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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