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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a4da05e18f244d3d16f535815e37a351b410b8abd9cbf1c0592302a4514bd1' 
  AND token = 'U6hACEofAHA5oxn6Tq3xCHum68ir7n+/eq2hvUzh2Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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