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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32d6fe023369ef721e69e2f95d14e6c2c13e67b42e2c2881db44ac04618b597' 
  AND token = 'LeJHyBlsRnM4056ldDhxmwCtUNLz3MrQau24wfH0or0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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