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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd531cd1a72d233d3718e9691b69b5ac1d797a9e17637aae120a3755741255153' 
  AND token = 'OvXTCf7GqTK37KkAEOxXZXBSjilJd83hJ5vCWcf+WFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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