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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e517cae2c2b2a63808c4c68a92ce4304d3c2acdb0d493cb1ceb9f487a58013' 
  AND token = 'cS9K6Gs7aoylNYY9FJeyitqJenUTBepY/879aGejzF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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