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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fc55b1f2afa401c8ad6b0fd9f1ca9f1e5bb9bedb7e4c9930ff49d9a83ab8be' 
  AND token = 'GoyTQTyXgbM9lQuybGKqIfllIL0o+sEniFVQ5Ig5oUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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