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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7097aeab9bfb63af91c10cedb08a091530cef333d67e318d677eb9b9a9088bfc' 
  AND token = 'n4282LpsD0tnMb1nmIqgGUIkWOSWYJNDE40WUkH+XA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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