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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5257b3a6a02d8f28d4bcb04c0ae75493aa34c6fc0c2635a369efb89c4ce0a139' 
  AND token = 'VNOh4oYnI72cm8fdOhDArM/T2PX8h0bBQUqa1slanv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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