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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af3d19aa650239757540dcc2e16e2da2f5f6ecebb9731ad6032db6c86ea6f7b' 
  AND token = 'onFMHT0hZ03v875Eeswr2SxD7nFLmBGgkRflotdGF6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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