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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ad1b038e42b1a705244bb424256cfa260d7280507f0443383b429ac9d7686e' 
  AND token = '56LS4TDmBnRyAS3hTndoZVTevJL3e07o0aP678NZpPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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