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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2706cc7454a8a3faf27c8b56837d1fe8d906ae86891afd01e3050ef44078d1' 
  AND token = 'vgJcjeRwaq71A2aO3hAc4gqbusBoGyp83Bm5mcS1wtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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