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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6d7d89477204da89ea289aa2dfe2d849b2ffbe70cba061c8fa84e5558d97e3' 
  AND token = 'RcIBbsS8147uY6IRIQO6Dz1RO7u4oYwfYWYRqPT4qRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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