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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499ab78b792d7645e3aadcc10768f65e88e6dea2938db485a389a972a906afa2' 
  AND token = '4fyE0pAIUe8apunj4K3fKrEqa9itUI0vVHLgVEMHqkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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