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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb840c87eaa5286731853a461ea40513cd8305ce1c9acd232a50093309a19e4' 
  AND token = 'Dvwh3hQxdfpLHTJoZl4TWUL8KO9f1PKe6uEH2mikA6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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