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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e90a85cbdfc0d0e226503091f67015446c46a88e33810f892461ce31104963b' 
  AND token = 'otzU6IIJmcB7DAc2GzLuKzNVtaQ++CYXetFZlW9+bbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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