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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d4403cc69aa08ab3b25d8bd75e9fb6c4058cfc059ca9fe7058367a2544f63d' 
  AND token = '+qebZmGVIeSaHkLLHmIILq2yW2S3tjKpc7dytD/Br+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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