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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a0b015e45e48f29847d3af919a46d2e649fe1462e66e24f67a6551a9c63711' 
  AND token = 'eUbWl9KkNKnoBmTV4xbNcrcce1NG2JC+Z6e5+1LCuJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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