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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f064fe9aabe489f28d5d41382c20b084c380b84da0db3b64604f8dae46497810' 
  AND token = 'G7iiquaIZQkojMqcI+GA7LOq1mrJEhU9/t00xJxNI9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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