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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7126bda4b552b551e26cbbbd7802ec8e54b6985ed488527ffb4e7dbe8b135e40' 
  AND token = 'ydDwJ5/v3X5D7Tbx6FUyYKd9/9ljz1Tqg7hz7/MTXK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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