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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541fe0fe2214f114801bffdd579dccc94288a0fd21097cf2822097a449471a97' 
  AND token = 'n8l+TU94D67pzMekBw4IQ5n0nis3JhJgdS0D3ZTKWIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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