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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02b1b09b71ef73a69502b19daf67b6517c0b967ecbece5acf50be93ae54f648' 
  AND token = 'aXCSeq0IoRoCQHzcIb6Ls8AUPYoE5nQx4DiFNyit7Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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