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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ddb94c30242b3baf7a5e2a80d2d7f4ce34ac7804924ad2aa03fe9ed4fdc8a9' 
  AND token = '8oCQ4/6EE0ScBTM16Icf6LPdpbJTP9DCN2ihgaclbzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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