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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d262aa67cbbb48a8a2ecd51e191217d63c3634a4ae8220ce66fd25dfd61bda' 
  AND token = 'WzufW1olwMxvjH8iwWuxMPYUhuCBGy8NA1CM1mztIuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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