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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304b91c41e0d2010d66c582e1a9a31f3e38a2dd87e75efec5080a2a234529bf2' 
  AND token = 'YUx4TadQgiKESzH8J6Htqr9ysqiflbya6jPeNZiqLH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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