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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a79bb795b887ae15cd561b8154a2da9654813055e2d0287a3645bb26847e292' 
  AND token = 'zyndyR87Gf7dnkbEuOE90CxFZrMBU/aw6DbSoXxRYMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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