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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c800b694292eedd4d254dc9bca02df919c099a36c513d5263138f4aadc54688' 
  AND token = '1MiuBlJrSWp/bSoZj+8OrE1s/XybkdvFyOY/ryR7qbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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