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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b67c4976770551b07a8b1c4d2c4ffe80ad1961041c5c178b23c0463f952f53' 
  AND token = 'lEJSK+ZzRCaSHJFsyyKRddyk/Lmx1RekyR4ZoswaAV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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