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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83791d4cbb55df274e24c4789a51efdb8a569bd3d0e66423408e6745c6ee584f' 
  AND token = 'UVh8ym3KSB/6VVbc01vd2rMWaWs/q9FuRuoya0fLd2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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